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“The Personal (Home Use) License for Sandboxie… does permit you to use Sandboxie on any number of computers that you personally own;”. In other words, even aside from having a lifetime license, if it’s at all likely that you’re going to personally own more than three machines, the Sandboxie licensing terms could come out much cheaper.
However, I don’t really understand the question. They are intended as two completely different types of software: AIS is intended to be a complete security solution (I think), while Sandboxie is a sandboxing program. On my XP systems, I use a firewall, AV, and a behavior shield in addition to Sandboxie.
I have never tried most of the functions in the newest versions of AIS. However, my personal experience and my impressions from the support boards of both programs is that Sandboxie is more reliable, and less likely to interact badly with other applications or with OS changes. The main difference that I noticed is in board support.
On both boards, fellow users do try to be helpful, and often succeed in solving problems, (although there is rare nastiness by fanboys on the Avast board). On the other hand, if the official Avast support people can’t solve your problem very quickly, the may quickly decide that neither you nor your problem are worth their time, even if it turns out that half a dozen other people have the same problem. You and the half dozen others will just be ignored. The author of Sandboxie is willing to go the extra mile to help you; after all, his pride is wrapped up in that program. I once had a problem of which he hand never heard, and couldn’t duplicate, on a system apparently almost identical to his development system; even though he couldn’t duplicate it, his instinct led him to immediately suggest an easy solution - not a workaround, a real solution - for the problem.
My $0.02. You can send me the change through PayPal.
C.